This is an invitation to a deeper appreciation for the celebration of the Mass and a greater conviction of its importance for our ordinary living-out of Christian faith in daily life. Taking into account the Catechism of the Catholic Church and the new edition of the General Instruction on the Roman Missal, Fr. John Baldovin, S.J., centers his lucid commentary on the Mass around the most recent official documents and provides an up-to-date survey of the historical development of the Mass from the New Testament to the present.